Jo Mattli (1907–1982) was a Swiss-born fashion designer who relocated to London in the 1930s, establishing a highly successful couture house in Mayfair. Known for his impeccable tailoring and elegant, wearable designs, Mattli became a founding member of the prestigious Incorporated Society of London Fashion Designers (IncSoc) in 1942. His designs were characterized by their structural sophistication and bias-cut draping, bringing Parisian sensibility to the defining 'London Look' of the mid-20th century. By partnering with the Vogue Pattern Service for their elite 'Vogue Couturier Design' and 'Vogue Paris Original' lines, Mattli's architectural garments were translated into precise blueprints. This historic collaboration bridged the gap between exclusive Mayfair ateliers and skilled home dressmakers globally, allowing seamstresses to construct legitimate couture eveningwear using high-grade tissue paper patterns that mapped every dart, drape, and seam of the original salon pieces.

The market for 1960s designer sewing patterns is exceptionally robust, driven by historical costumers and vintage fashion enthusiasts seeking authentic mid-century silhouettes. Valuation is strictly dictated by condition and completeness: pristine, factory-folded (uncut) examples retaining their original woven 'Vogue Couturier Design' sew-in labels establish a firm market ceiling, with direct matches for Vogue 1548 selling up to $124. Conversely, the fact that modern digital photocopies of this exact design steadily sell for roughly $30 establishes a strict price floor for an authentic vintage original. Assuming the subject item's 12 pieces are complete but previously cut and lacking the premium fabric label, the conservative auction estimate falls squarely in the $45 to $85 tier, perfectly aligning with secondary comparables for cut-but-complete Mattli eveningwear.